Efficient hydrate inhibitor

A hydrate inhibitor and high-efficiency technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of unsatisfactory effect and difficulty in agglomeration of hydrates, and achieve low cost, large dosage, The effect of adding a low amount

Active Publication Date: 2009-12-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the anti-polymerization agent cannot prevent the formation of gas hydrate in the pipeline, it can make it difficult for the hydrate to coalesce into blocks
Compared with kinetic inhibitors, it can be used when the pipeline (or oil well) is closed or the degree of subcooling is large, but its effect when used alone is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The experimental method and steps are the same as those in the comparative example. Add 150mL crude oil sample to the reactor, and add the inhibitor of the present invention to the crude oil sample. The mass ratio of inhibitor to water in the crude oil sample is 10.5%, and the mass ratio of span20 to water is 0.5%, the mass ratio of ethylene glycol and water is 10%, the reaction initial temperature is set as 3 ℃, feeds gas (CH 4 91.05%, C 2 h6 6.05%, C 3 h 8 2.90%), make the pressure reach 6MPa, open the magnetic stirrer and start the reaction. At the end of the reaction, it was measured that the hydrate formation time was 148 minutes and the complete formation time was 294 minutes. The results show that the combined use of 0.5% Span20 and 10% ethylene glycol significantly prolongs the formation time and complete formation time of hydrates, and the anti-polymerization and inhibition performances of Span20 and ethylene glycol are both significantly improved.

Embodiment 2

[0035] Add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, with respect to the quality of water in crude oil sample, the mass ratio of inhibitor of the present invention and water is 21%, wherein Span 20 (Sorbitan single The mass ratio of laurate) to water is 1%, and the mass ratio of ethylene glycol to water is 20%. The experimental method and steps are as in Example 1. The hydrate generation time is 170min, and the complete generation time is 417min. The results show that the combined use of 1% Span 20 and 20% ethylene glycol significantly prolongs the formation time and complete formation time of hydrates, and the anti-polymerization and inhibition performances of Span20 and ethylene glycol are both significantly improved.

Embodiment 3

[0037] Add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, with respect to the quality of water in crude oil sample, the mass ratio of inhibitor of the present invention and water is 5.2%, wherein Span 20 (Sorbitan mono The mass ratio of lauric acid ester) to water is 0.2%, the mass ratio of ethylene glycol to water is 5%, the experimental method and steps are as in Example 1, the hydrate generation time is 118min, and the complete generation time is 250min. The results show that the combined use of 0.2% Span 20 and 5% ethylene glycol prolongs the formation time and complete formation time of hydrate to a certain extent, but the concentration of ethylene glycol is low and the amount of Span 20 is high. It is not in the optimal dosage range, so the inhibitory effect is limited.

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PUM

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Abstract

The invention provides an efficient hydrate inhibitor, relating to the technical field of oil-gas hydrate. The hydrate inhibitor is a mixture of an anti-agglomerant and a glycol or an isopropanol and is used at the pressure of 1.5 to 25 MPa and at the temperature of minus 20 DEG C to 25 DEG C. The hydrate inhibitor overcomes the defects of the prior art, reduces the nucleary, the growth and the coalescence speed of hydrate after being filled in petroleum fluid in production or conveying by mixing at low concentration and has the characteristics of wide application and low cost.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to an efficient hydrate inhibitor. technical background [0002] In the pipelines of natural gas and petroleum fluids, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, and hydrogen sulfide coexist with water. Under low temperature and high pressure conditions, gas hydrates, namely water and light hydrocarbons, will be formed. Cage crystals formed by small molecular gases. The clogging of natural gas / crude oil production units and pipelines due to the formation of hydrates is a thorny problem that has plagued oil and gas production and transportation departments for a long time. For the development of offshore oil and gas fields and pipeline transportation in deep sea areas, the water temperature and pressure conditions on the seabed are very suitable for the formation of hydrates, and the problem of hydrates is particularly prominent. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
Inventor 樊栓狮郎雪梅王燕鸿杜娟毕丹丹杨亮
Owner SOUTH CHINA UNIV OF TECH
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